Revert of cc: Increase kMaxCopyOperations to 32.

Revert of cc: Increase kMaxCopyOperations to 32. (patchset #1 id:1 of https://codereview.chromium.org/937843006/)

Reason for revert:
This is likely to cause a crash on the Webkit Linux MSAN bot:

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#master=ChromiumWebkit&tests=virtual/gpu/fast/canvas/canvas-path-context-clip.html

Below is the stack:

crash log for gpu (pid <unknown>):
STDOUT: #CRASHED - gpu
STDERR: [21350:21350:1203/112619:8509072119133:FATAL:gles2_cmd_copy_texture_chromium.cc(263)] Check failed: !buffer_id_.
STDERR: #0 0x7f2ee72e416e base::debug::StackTrace::StackTrace()
STDERR: #1 0x7f2ee737e965 logging::LogMessage::~LogMessage()
STDERR: #2 0x7f2ee598c5be gpu::CopyTextureCHROMIUMResourceManager::~CopyTextureCHROMIUMResourceManager()
STDERR: #3 0x7f2ee59e48ae base::DefaultDeleter<>::operator()()
STDERR: #4 0x7f2ee59e486b base::internal::scoped_ptr_impl<>::reset()
STDERR: #5 0x7f2ee59d467d scoped_ptr<>::reset()
STDERR: #6 0x7f2ee59b373f gpu::gles2::GLES2DecoderImpl::Destroy()
STDERR: #7 0x7f2ee2332bd9 content::GpuCommandBufferStub::Destroy()
STDERR: #8 0x7f2ee2332665 content::GpuCommandBufferStub::~GpuCommandBufferStub()
STDERR: #9 0x7f2ee2332ca9 content::GpuCommandBufferStub::~GpuCommandBufferStub()
STDERR: #10 0x7f2ee231d72e IDMap<>::Releaser<>::release()
STDERR: #11 0x7f2ee231cd4d IDMap<>::Remove()
STDERR: #12 0x7f2ee231a252 content::GpuChannel::OnDestroyCommandBuffer()
STDERR: #13 0x7f2ee231e3da DispatchToMethod<>()
STDERR: #14 0x7f2ee231e21d IPC::SyncMessageSchema<>::DispatchWithSendParams<>()
STDERR: #15 0x7f2ee231c8ad GpuChannelMsg_DestroyCommandBuffer::Dispatch<>()
STDERR: #16 0x7f2ee2319731 content::GpuChannel::OnControlMessageReceived()
STDERR: #17 0x7f2ee2318583 content::GpuChannel::HandleMessage()
STDERR: #18 0x7f2ee23208e2 base::internal::RunnableAdapter<>::Run()
STDERR: #19 0x7f2ee23207f3 base::internal::InvokeHelper<>::MakeItSo()
STDERR: #20 0x7f2ee2320795 base::internal::Invoker<>::Run()
STDERR: #21 0x7f2ee72cc5be base::Callback<>::Run()
STDERR: #22 0x7f2ee72ea7a9 base::debug::TaskAnnotator::RunTask()
STDERR: #23 0x7f2ee73a76d8 base::MessageLoop::RunTask()
STDERR: #24 0x7f2ee73a783b base::MessageLoop::DeferOrRunPendingTask()
STDERR: #25 0x7f2ee73a7a75 base::MessageLoop::DoWork()
STDERR: #26 0x7f2ee72a012e base::MessagePumpGlib::Run()
STDERR: #27 0x7f2ee73a71a2 base::MessageLoop::RunHandler()
STDERR: #28 0x7f2ee740ff94 base::RunLoop::Run()
STDERR: #29 0x7f2ee73a68e1 base::MessageLoop::Run()
STDERR: #30 0x7f2ee23bed92 content::GpuMain()
STDERR: #31 0x7f2ee142f02f content::RunNamedProcessTypeMain()
STDERR: #32 0x7f2ee14333a2 content::ContentMainRunnerImpl::Run()
STDERR: #33 0x7f2ee142e4d5 content::ContentMain()
STDERR: #34 0x00000044ec9c main
STDERR: #35 0x7f2ed82f676d __libc_start_main
STDERR: #36 0x00000044eb89 <unknown>
STDERR:
STDERR: Received signal 6
STDERR: #0 0x7f2ee72e416e base::debug::StackTrace::StackTrace()
STDERR: #1 0x7f2ee72e3ca3 base::debug::(anonymous namespace)::StackDumpSignalHandler()
STDERR: #2 0x7f2ed86a4cb0 <unknown>
STDERR: #3 0x7f2ed830b425 gsignal
STDERR: #4 0x7f2ed830eb8b abort
STDERR: #5 0x7f2ee72e02f6 base::debug::(anonymous namespace)::DebugBreak()
STDERR: #6 0x7f2ee72e02d9 base::debug::BreakDebugger()
STDERR: #7 0x7f2ee737ecca logging::LogMessage::~LogMessage()
STDERR: #8 0x7f2ee598c5be gpu::CopyTextureCHROMIUMResourceManager::~CopyTextureCHROMIUMResourceManager()
STDERR: #9 0x7f2ee59e48ae base::DefaultDeleter<>::operator()()
STDERR: #10 0x7f2ee59e486b base::internal::scoped_ptr_impl<>::reset()
STDERR: #11 0x7f2ee59d467d scoped_ptr<>::reset()
STDERR: #12 0x7f2ee59b373f gpu::gles2::GLES2DecoderImpl::Destroy()
STDERR: #13 0x7f2ee2332bd9 content::GpuCommandBufferStub::Destroy()
STDERR: #14 0x7f2ee2332665 content::GpuCommandBufferStub::~GpuCommandBufferStub()
STDERR: #15 0x7f2ee2332ca9 content::GpuCommandBufferStub::~GpuCommandBufferStub()
STDERR: #16 0x7f2ee231d72e IDMap<>::Releaser<>::release()
STDERR: #17 0x7f2ee231cd4d IDMap<>::Remove()
STDERR: #18 0x7f2ee231a252 content::GpuChannel::OnDestroyCommandBuffer()
STDERR: #19 0x7f2ee231e3da DispatchToMethod<>()
STDERR: #20 0x7f2ee231e21d IPC::SyncMessageSchema<>::DispatchWithSendParams<>()
STDERR: #21 0x7f2ee231c8ad GpuChannelMsg_DestroyCommandBuffer::Dispatch<>()
STDERR: #22 0x7f2ee2319731 content::GpuChannel::OnControlMessageReceived()
STDERR: #23 0x7f2ee2318583 content::GpuChannel::HandleMessage()
STDERR: #24 0x7f2ee23208e2 base::internal::RunnableAdapter<>::Run()
STDERR: #25 0x7f2ee23207f3 base::internal::InvokeHelper<>::MakeItSo()
STDERR: #26 0x7f2ee2320795 base::internal::Invoker<>::Run()
STDERR: #27 0x7f2ee72cc5be base::Callback<>::Run()
STDERR: #28 0x7f2ee72ea7a9 base::debug::TaskAnnotator::RunTask()
STDERR: #29 0x7f2ee73a76d8 base::MessageLoop::RunTask()
STDERR: #30 0x7f2ee73a783b base::MessageLoop::DeferOrRunPendingTask()
STDERR: #31 0x7f2ee73a7a75 base::MessageLoop::DoWork()
STDERR: #32 0x7f2ee72a012e base::MessagePumpGlib::Run()
STDERR: #33 0x7f2ee73a71a2 base::MessageLoop::RunHandler()
STDERR: #34 0x7f2ee740ff94 base::RunLoop::Run()
STDERR: #35 0x7f2ee73a68e1 base::MessageLoop::Run()
STDERR: #36 0x7f2ee23bed92 content::GpuMain()
STDERR: #37 0x7f2ee142f02f content::RunNamedProcessTypeMain()
STDERR: #38 0x7f2ee14333a2 content::ContentMainRunnerImpl::Run()
STDERR: #39 0x7f2ee142e4d5 content::ContentMain()
STDERR: #40 0x00000044ec9c main
STDERR: #41 0x7f2ed82f676d __libc_start_main
STDERR: #42 0x00000044eb89 <unknown>
STDERR:   r8: 000000000000007c  r9: 0000000000500000 r10: 0000000000000008 r11: 0000000000000206
STDERR:  r12: 000000000044eb60 r13: 00007fff5e500ac0 r14: 0000000000000000 r15: 0000000000000000
STDERR:   di: 0000000000005366  si: 0000000000005366  bp: 00007fff5e4fd330  bx: 0000000000000000
STDERR:   dx: 0000000000000006  ax: 0000000000000000  cx: ffffffffffffffff  sp: 00007fff5e4fd1f8
STDERR:   ip: 00007f2ed830b425 efl: 0000000000000206 cgf: 0000000000000033 erf: 0000000000000000
STDERR:  trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000

Original issue's description:
> cc: Increase kMaxCopyOperations to 32.
>
> Increase max number of copy operations from 16 to 32. This
> improves the throughput on systems where raster performance
> is relatively high.
>
> BUG=454898
>
> Committed: https://crrev.com/ed9a3edff6bffc58ff37c2bd78b768062771b647
> Cr-Commit-Position: refs/heads/master@{#317614}

TBR=vmpstr@chromium.org,vangelis@chromium.org,reveman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=454898
Committed: https://crrev.com/3649a12ed7bc7244a2d0e6970c5655544e46487f
Cr-Commit-Position: refs/heads/master@{#317661}

[Zhenyao Mo, 2015-02-23 21:56:26]

Created Revert of cc: Increase kMaxCopyOperations to 32.

[commit-bot: I haz the power, 2015-02-23 21:58:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/941253003/1

[commit-bot: I haz the power, 2015-02-23 21:59:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-23 22:00:27]

Patchset 1 (id:??) landed as
https://crrev.com/3649a12ed7bc7244a2d0e6970c5655544e46487f
Cr-Commit-Position: refs/heads/master@{#317661}

[Zhenyao Mo, 2015-02-24 17:15:12]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/949253002/ by zmo@chromium.org.

The reason for reverting is: After reverting the crash is still there, likely
caused by the skia roll.  Created crbug.com/461399 to keep track, and relanding
the reverted CL..